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RISS 인기검색어
- 검색키워드
- 저자 : Junhong Wei (검색결과 6 건)
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Plasma-assisted synthesis of bicrystalline ZnS nanobelts with enhanced photocatalytic ability
Qiushi Wang,Junhong Li,Wei Zhang,Min Zhong 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.2
ZnS nanobelts have been synthesized by a reaction of Zn and S powders using the simple arc discharge method. The productswere characterized using X-ray diff raction, Raman spectroscopy, scanning and transmission electron microscopy, as wellas energy-dispersive X-ray spectrometer. The results reveal that the ZnS nanobelts exhibit bicrystalline nanostructure. Theroles of ion bombardment and plasma species in the growth of bicrystalline ZnS nanobelts are discussed. The ZnS nanobeltsexhibit strong emission peaked at 516 nm under a 373 nm UV light excitation and excellent photocatalytic ability fordegradation of methylene blue. This work represents a new strategy to synthesize bicrystalline nanostructures for design ofoptoelectronic nanodevices and photocatalysts.
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Fuzzy reliability analysis of laminated composites
Chen, Jianqiao,Wei, Junhong,Xu, Yurong Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.22 No.6
The strength behaviors of Fiber Reinforced Plastics (FRP) Composites can be greatly influenced by the properties of constitutive materials, the laminate structures, and load conditions etc, accompanied by many uncertainty factors. So the reliability study on FRP is an important subject of research. Many achievements have been made in reliability studies based on the probability theory, but little has been done on the roles played by fuzzy variables. In this paper, a fuzzy reliability model for FRP laminates is established first, in which the loads are considered as random variables and the strengths as fuzzy variables. Then a numerical model is developed to assess the fuzzy reliability. The Monte Carlo simulation method is utilized to compute the reliability of laminas under the maximum stress criterion. In the second part of this paper, a generalized fuzzy reliability model (GFRM) is proposed. By virtue of the fact that there may exist a series of states between the failure state and the function state, a fuzzy assumption for the structure state together with the probabilistic assumption for strength parameters is adopted to construct the GFRM of composite materials. By defining a generalized limit state function, the problem is converted to the conventional reliability formula that enables the first-order reliability method (FORM) applicable in calculating the reliability index. Several examples are worked out to show the validity of the models and the efficiency of the methods proposed in this paper. The parameter sensitivity analysis shows that some of the mean values of the strength parameters have great influence on the laminated composites' reliability. The differences resulting from the application of different failure criteria and different fuzzy assumptions are also discussed. It is concluded that the GFRM is feasible to use, and can provide an effective and synthetic method to evaluate the reliability of a system with different types of uncertainty factors.
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Jianqiao Chen,Wenjie Peng,Junhong Wei,Rui Ge 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.31 No.4
The present paper addresses the optimal design of composite laminates with the aim of minimizing free-edge delamination stresses. A technique involving the application of particle swarm optimization (PSO) integrated with FEM was developed for the optimization. Optimization was also conducted with the zero-order method (ZOM) included in ANSYS. The semi-analytical method, which provides an approximation of the interlaminar normal stress of laminates under in-plane load, was used to partially validate the optimization results. It was found that optimal results based on ZOM are sensitive to the starting design points, and an unsuitable initial design set will lead to a result far from global solution. By contrast, the proposed method can find the global optimal solution regardless of initial designs, and the solutions were better than those obtained by ZOM in all the cases investigated.
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Chen, Jianqiao,Peng, Wenjie,Ge, Rui,Wei, Junhong Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.31 No.4
The present paper addresses the optimal design of composite laminates with the aim of minimizing free-edge delamination stresses. A technique involving the application of particle swarm optimization (PSO) integrated with FEM was developed for the optimization. Optimization was also conducted with the zero-order method (ZOM) included in ANSYS. The semi-analytical method, which provides an approximation of the interlaminar normal stress of laminates under in-plane load, was used to partially validate the optimization results. It was found that optimal results based on ZOM are sensitive to the starting design points, and an unsuitable initial design set will lead to a result far from global solution. By contrast, the proposed method can find the global optimal solution regardless of initial designs, and the solutions were better than those obtained by ZOM in all the cases investigated.
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Bingrong Guo,Bin Liu,Chaoli Wang,Junhong Lu,Yuhua Wang,Shu Yin,Muhammad Sufyan Javed,Wei-Hua Han 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-
Due to the high redox ability and effective separation of photocharges, Z-schemed photocatalysts havebeen extensively used to deal with energy crises and environmental pollution. Here, a novel Zschemedg-C3N4/RGO/ln2S3 photocatalyst was designed and prepared for hydrogen generation and tetracyclinehydrochloride degradation. The properties of optical absorption, separation, and transfer of photochargesand heterojunction on photocatalytic activity of g-C3N4/RGO/ln2S3 composite have beenstudied. The characterization results showed that the Z-scheme photocatalyst has high efficiency onthe separation and transfer of photocharges, and the strong redox ability has also remained. Thus, theg-C3N4/RGO/ln2S3 composite exhibited superior photocatalytic performance than pristine ln2S3 and g-C3N4 in the same situations. The H2 evolution rate can reach up to 512.72 lmolg-1h1 and the degradationof tetracycline hydrochloride can reach 95.6% in 60 min under visible light irradiation. This work providesa potential pathway for designing and preparing high-performance photocatalysts to produce cleanenergy and purify the environment.
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